Optical multiplexer and method for its production
a technology of optical multiplexers and optical filters, applied in the field of optical multiplexers, can solve the problems of increasing the error rate of transmission signals, large dispersion of awgs, and large waveform distortion of signals, and achieve the effect of reducing the dispersion of awgs
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embodiment 1
[0051]FIG. 12 shows the first embodiment of the present invention. Namely, FIG. 12 shows an optical multiplexer constructed from an input channel optical waveguide 11, a first slab optical waveguide 12 for expanding the input light in a direction parallel with respect to the optical waveguide, a channel optical waveguide array 13 constructed from a plurality of optical waveguides in which each m'th optical waveguide has a length mΛM+δ(m) with respect to the inside (m−1) 'th optical waveguide, a second slab optical waveguide 14 for creating interference with the light of the arrayed optical waveguides, and an output channel optical waveguide 15 which are sequentially connected in tandem on an optical waveguide substrate. The term δ(m) is the adjustment value of the waveguide length determined by a method described later. Further, the waveguide length of adjacent arrayed optical waveguides of the channel optical waveguide array 13 is ΔM=31 μm, the number of optical waveguides of the c...
embodiment 2
[0071]The second embodiment of the present invention will now be described. In the first embodiment, the propagating light that is incident from the parabolic optical waveguide of the input channel optical waveguide propagates through the first slab optical waveguide, and after this light reaches the channel optical waveguide array, calculations were carried out to determine what kind of optical distribution was excited at each of the optical waveguides, and then the loss α(m)(dB) that should be added to the m'th optical waveguide was calculated using the theoretical value αtheory(m) and the target value αgoal(m) of the electric field amplitude excited at the channel optical waveguide array. Further, the amount of phase Θ(m) (rad) that should be adjusted for the m'th optical waveguide was calculated using the theoretical value θtheory(m) and the target value θgoal(m) of the electric field phase excited at the channel optical waveguide array.
[0072]In the present invention, a trial op...
embodiment 3
[0083]In the first embodiment of the present invention, the method of providing the desired loss (dB) was described as being a method in which the central axis of the optical waveguide is shifted as shown in FIG. 22.
[0084]As one method of providing the loss, in the case where the method of shifting the central axis of the optical waveguide of the channel optical waveguide array 13 described above is carried out, because the arc of the channel optical waveguide array 13 needs to be returned to its original position, two positions are required for shifting the axis. Now, because the axis is shifted between two positions, the amount of loss provided at one axial shift position becomes α / 2 (dB) which is half of the axial shift loss α shown in FIG. 23.
[0085]As for the portion where the axis is shifted for the m'th optical waveguide of the channel optical waveguide array 13, such shift may occur above the m'th optical waveguide, but when left and right symmetrical axial shift portions are...
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